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Java > Open Source Codes > com > db4o > nativequery > expr > BinaryExpression


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.nativequery.expr;
22
23 public abstract class BinaryExpression implements Expression {
24
25     protected Expression _left;
26     protected Expression _right;
27     
28     public BinaryExpression(Expression left, Expression right) {
29         this._left = left;
30         this._right = right;
31     }
32         
33     public Expression left() {
34         return _left;
35     }
36
37     public Expression right() {
38         return _right;
39     }
40     
41     public boolean equals(Object JavaDoc other) {
42         if (this == other) {
43             return true;
44         }
45         if (other == null || getClass() != other.getClass()) {
46             return false;
47         }
48         BinaryExpression casted = (BinaryExpression) other;
49         return _left.equals(casted._left)&&(_right.equals(casted._right))||_left.equals(casted._right)&&(_right.equals(casted._left));
50     }
51     
52     public int hashCode() {
53         return _left.hashCode()+_right.hashCode();
54     }
55 }
56
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